Some research on internet about the best parameters to setup:

The sync speed is depending on the specification of the flash unit but not our trigger unit.

Herewith an example we calculate from 580EX.

The calculation below is based on a Canon system of 30D and Speedlite 580EX:

Ts = shutter speed

Tf = flash speed

Tr = transmission time from V2 transmitter to receiver

Tfv2 = responding time of the flash after V2 is in use

Under normal circumstances, Ts = Tf = 1/250s (the highest responding time of Canon)

When the wireless flash trigger is in use:

Tfv2 = Tf - Tr,

Therefore,

Tr = 1/500s

Tfv2 = Tf - Tr = 1/500s

Therefore

Ts = 2 x Tfv2 = 1/125s only.

That’s why you cannot get the sync speed up to 1/250s.

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